一种基于多级DCT和SVD的鲁棒数字水印算法.pdf

第29卷第7期 计算机应用与软件 V01．29No．7 andSoftware 2012牟7月 ComputerApplications Jul．2012 一种基于多级DCT和SVD的鲁棒数字水印算法 曲长波 阎 妍 (辽宁工程技术大学软件学院辽宁葫芦岛125105) 擒要 从提高数字水印鲁捧性的角度出发，算法在充分考虑传统离散余弦变换不能有效抵抗旋转几何攻击的基础上．提出一种 地抵抗有损压缩和一些通常的匿像处理操作，鲁棒性较好。 关键词 数字水印 离散余弦交换 多级奇异值分解鲁棒性 中图分类号TP391 文献标识码A ARoBUSTDIGITALWATERMARKINGALGoRITHMBASEDON MULTIPLELEVELDCTANDSVD YahYah QuChangbo (School Ttdmitd o，s咖∞ngIⅧ一w．LiaoningUnivem玎．，Huludao125105，hoo,a,培，Ch／na) AbstractFromthe of therobustnessof into takesconsiderationtheinsufficient perspectiveimproving digitalwatermarking，thealgorithm resistancerotated withtraditionaldiscretecosine a basedOn agaimt geometry．attack tramform．andpresentsdi西山watermarkingalgorithm leveldiscrete value DCT cosi眦transform(DOT)and andSVD realizes multiple singulardecomposition(SVD)．Bycombining together．it the oftransformdomainand domain noise normalized comprehensiveapplication spsce algorithms，Througllpeaksi酬to ratio(PSNR)and correlation evaluatesthe ofthe resultsthatthis coefficient(NC)the show cn paper performancealgorithm．Experimentalalgorithm effectively resist andafew robustness． lossycompressioncomm01]imageoperations“thquitegood Di Discrete